package com.mars.util;


import lombok.extern.slf4j.Slf4j;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import org.codehaus.jackson.map.ser.impl.SimpleFilterProvider;
import org.codehaus.jackson.type.TypeReference;

/**
 * 一个类转换成json对象
 * json字符串转换从系统中的类对象
 * @author MARS
 * @date 2017/12/28
 */
@Slf4j
public class JsonMapper {


    private static ObjectMapper objectMapper = new ObjectMapper();

    static {
        //config
        objectMapper.disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES);
        objectMapper.configure(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS,false);
        objectMapper.setFilters(new SimpleFilterProvider().setFailOnUnknownId(false));
        objectMapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_EMPTY);

    }

    //对象 -->  字符串
    public static <T> String obj2String(T src){
        if(src == null){
            return null;
        }
        try {
            return src instanceof String ? (String)src : objectMapper.writeValueAsString(src);
        } catch (Exception e) {
            log.warn("parse object to String exception",e);
            return null;
        }
    }

    //string ---> 对象
    public static <T>T string2Obj(String src , TypeReference<T> typeReference){

        if(src == null || typeReference ==null){
            return null;
        }

        try {
            return (T) (typeReference.getType().equals(String.class) ? src : objectMapper.readValue(src,typeReference));
        } catch (Exception e) {
            log.warn("parse String to object exception,String:{},TypeReference<T>:{},error:{}",src,typeReference.getType(),e);
            return null;
        }

    }



}
